However, the Boring Company site states that due to high demand, tours of the tunnel will be by "invitation only."

It's opening a little over a week late

Musk tweeted in October that the tunnel would open on December 10, but was pushed back by eight days. When Musk announced the delay on Twitter, he said the new date will be "more than a tunnel opening."

Boring Company product launch on Dec 18. More than a tunnel opening. Will include modded but fully road legal autonomous transport cars & ground to tunnel car elevators.

It's taken almost two years to complete

The Boring Company started work on the Hawthorne tunnel in early 2017. Musk tweeted some astonishing footage of The Boring Company's enormous subterranean drill emerging in "O'Leary Station" in November.

The tunnel will be flanked by a "Monty Python"-inspired watchtower

A medieval watchtower has been built to accompany the tunnel. Musk tweeted in November that he was looking to hire someone to "yell insults at people in a French accent," a reference to"Monty Python and the Holy Grail."

Passers-by have tweeted pictures of a medieval-style watchtower being built, and Musk has commented describing the tower as "medieval futurism."

The Boring Company abandoned plans to build another test tunnel in Los Angeles

The company axed plans to build its Sepulveda test tunnel - which would have run from a property on Sepulveda Boulevard to Washington Boulevard in Culver City - after local groups sued the city over its proposal to exempt the Boring Company from environmental reviews.

A Boring Company spokesman said the company had changed gears and was instead looking to "construct an operational tunnel at Dodger Stadium." The Boring Company also has plans to build an underground transit system between major cities called Hyperloop.

Musk has said the Boring Company "started out as a joke" and that the tunnel may be a failure